This report covers the dry and wet season studies of Cycle I of the CRSP Global Experiment, which were conducted during 1985 in Gualaca. The purpose of the studies was to establish a baseline of physical, chemical, biological, and hydrologicalcharacteristics for a set of ponds being fertilized solely with inorganic phosphorus.The cimate at Gualaca is seasonal, with one lainy and one dry season each year. TheCycle I experiment was therefore conducted once each season to determine if there were differences related to season.